US3011826A

US3011826A - Lightweight crew seat for high performance flight vehicles

Info

Publication number: US3011826A
Application number: US901A
Authority: US
Inventors: John I R Bowring; Elkins William
Original assignee: Individual
Current assignee: Individual
Priority date: 1960-01-06
Filing date: 1960-01-06
Publication date: 1961-12-05
Anticipated expiration: 1978-12-05
Also published as: GB944150A

Description

Dec. 5, 1961 1. R. BowRlNG ET AL 3,011,826

ANCE FLIGHT VEHICLES LIGHTWEIGHT CREW SEAT FOR HIGH PERFORM Filed Jan. 6, 1960 7 Sheets-Sheet 1 0 s TGN mmm VR NWE IO BM W RA O 59 l a nl.. 2125 l 5 2 2 mvuW ATTORNEYS Dec. 5, 1961 J. x. R. BowRlNG ETAL 3,011,825

LICRTWEICHT CREw SEAT FoR HIGH PERFORMANCE FLIGHT VEHICLES Filed Jan. 6, 1960 7 Sheets-Sheet 2 Pig- 5|a. /"l/ 2 f o j INVENTORS JOHN LR BOWRING WILLIAM ELKI S u/EE ATTORNE S Dec. 5, 1961 J. l. R. BowRlNG ETAL 3,011,826

LICHIWEICEI CREw SEAT ECR HIGH PERFORMANCE FLICRI VEHICLES Filed Jan. 6, 1960 '7 Sheets-Sheet 5 INVENTORS JOHN I.R.BOWR|NG WILLIAM ELK S ATToREYs Dec. 5, 1961 J. l. R. BOWRING I'AL LIGHTWEIGHT CREW SEAT FOR HIGH PERFORMANCE FLIGHT VEHICLES Filed Jan. 6, 1960 '7 Sheets-Sheet 4 INVENTORS JOHN LR. BOWRING Il WILLIAM ELK! S oRlEYs Dec. 5, 1961 J. l. R. BowRlNG ETA. 3,011,826

LICRIWRICHI CREW SEAT FCR RICR PERFORMANCE FLIGHT VEHICLES Filed Jan. 6, 1960 7 Sheets-Sheet 5 27 ,f RN ,0 24 /25 8 22 ^34 35 E L `\5l 29 l l I 3o l i 26 l l l l Fgfi 23 l 32 2 F19 'il s y L 2 INVENToRs JOHN LR. BOWRING TJ? BY WlLLlAM ELK NS ,j

Dec. 5, 1961 J. l. R. BOWRING ETAL 3,011,826

LIGI-ITWEIGI-IT CREW SEAT FOR HIGH PERFORMANCE FLIGHT VEHICLES 7 Sheets-Sheet 6 Filed Jan. 6, 1960 INVENTORS JOHN I.R.BOWRING BY WILLIAM EL INS LUM ATToRrIEY Dec. 5, 1961 J. 1. R. BowRlNG Erm. 3,011,826

LIGHIWEIGHI cREw SEAT EOE HIGH PERFORMANCE FLIGHT VEHICLES Filed Jan. 6, 1960 '7 Sheets-Sheet '7 INVENTORS JOHN LR. BOWRING WILLIAM EL INS ATTORNEY United States Patent I Filed Jan. 6, 1960, ser. Nn. 901 9 claims. (ci. 297-383) The invention described herein may be manufactured and used by or for the United States Government for governmental purposes without payment to us of any royalty thereon.

This invention relates to improved seats for use in aircraft, and more particularly to a lightweight crew seat for high performance flight vehicles which offers resistance of the seat occupant to very high acceleration, vibration, deceleration and impact loads of high magnitude.

An object of the invention is the provision of a pilots or crews seat which oder-s extreme comfort to the occupant, and means for increasing the occupants resistance to the adverse effects of high acceleration forces to which he may be subjected in take-off, flight, deceleration and crash loads and involves a seat having a yieldable bodyconforming supporting means for the pilots or occupants head, back, body, arms and legs.

A further object is the provision of a pilots seat having a strong lightweight tubular reinforced frame comprising a back rest including a head rest, a seat pan, and a leg rest, in which the back rest and seat pan are yieldably connected to each other for angular adjustment, and includes a yieldable fabric covering of nylon or dacron mesh connected to the frame and extending across the seat pan and leg rest without interruption and a second yieldable fabric covering extending across the back and head rest longitudinally, in which yieldable connecting means are provided between the back rest and seat pan and connected to the adjacent ends of the yieldable fabric covering at the juncture between the back rest and the seat pan.

A further object is a composite seat with combined high strength with low weight.

A further object is the provision of an aircraft seat comprising an upper adjustable back and head rest frame, an adjoining seat pan frame, and a leg rest frame adjustably connected to the forward end of the seat pan frame, which is constructed of strong lightweight small tubing outlining the sides of the back, the seat pan, the leg rest, the upper end of the back and head rest, and the lower end of the leg rest, with a yieldable resilient back and head-supporting fabric stretched across the back and head rest frame on said tubing in unsupported relation therebetween, and a yieldable resilient seat pan and leg rest supporting fabric stretched across the tubing of the seat pan and leg rest portion in unsupported relation therebetween from the lower end of the leg rest frame to the rear portion of the seat pan frame, and includes adjustable flexible lacing means connecting the adjacent edges of fabrics at the lower portion of the back rest and at the rear end portion of the seat pan.

A further object is the utilization of the arrangement of the lacing means between the adjacent ends of the yieldable resilient fabrics to provide means for permitting angular adjustment of the back rest relative to the seat pan, and also providing for adjustment between the seat panv and back rest for different size personnel as well as for adjustment of the longitudinal tension on the yieldable fabric on the leg rest, seat pan, and back and head rests.

rice

A further object includes lightweight tubular brace means extending between side frames of the seat pan and back rest located in materially depressed or offset relation to the stretched fabric to prevent the occupant from contact therewith during extreme acceleration forces on the seat and the occupant.

A further object is the contourlng of the tubular side frames of the leg rest, seat pan, and back and head rests to substantially conform to the average contour of the back of the legs, seat, body and the head of the occupant so that the stretched fabric covering will initially conform substantially to the back of the legs, seat, back and head of the occupant to support the occupant substantially uniformly from head to foot during accelerations.

A further object is the provision of a body supporting rest device for resisting high acceleration, which is adjustable longitudinally for occupants of different heights, and angularly adjustable for different conditions of aircraft take-off, normal flight, and rest.

A further object is the provision of a seat which is readily adjustable to accommodate substantially all tall and short personnel of Air Force tiying crews.

Other objects and advantages of the invention will become apparent from the following description and accompanying drawings in which like reference characters refer to similar parts in the several figures of the drawings.

Drawings FIG. l is a somewhat schematic perspective view of a seat constructed in accordance to the subject invention, showing the parts in assembled relation with the fabric covering broken away and lacing between the adjacent ends of the fabrics and the ends of the tubular back rest frame and seat pan frame;

FIG. 2 is a fragmentary somewhat diagrammatic view, more clearly showing the lacing adjustments and connection between the lower end of the back rest frame, the rear end of the seat pan frame, and between the adjacent ends of the stretched resilient fabrics on the seat pan frame and leg rest frame, and on the back and head rest frame;

iFIG. 3 is a side elevation of the back and head rest frame;

FIG. 4 is a plan View of the frame shown in FIG. 3;

FIG. 5 is a side elevation of the seat pan frame;

FIG. 6 is a top plan view or elevation of the seat pan frame shown in FIG. 5;

FIG. 7 is an end view of the seat pan frame locking toward the leg section adjoining end;

FIG. 8 is a side elevation of the leg rest supporting frame;

FIG. 9 -is a top plan view of the leg rest supporting frame;

FIG. `10 is an end view of the leg supporting frame, looking toward the hinge end thereof; and

PIG. ll is a diagrammatic view showingthe relative', positions or angles of adjustment of the back rest during launch or take-off, normal wor and rest positions, also showing diagrammatically the general change in position of the occupants body during high acceleration, due to resilient stretch of the fabric covering on the tubular frames;

PIG. l2 is a sectional View of one of the cooperating adjustable pivot means between the side-rods of the back rest frame and the seat pan frame;

FIG. 13 is a sectional view of the pivot means shown in FIG.' l2 taken about on line 13-13 in FIG. l2; andl FIG. 14 discloses a modified form ofinterlacing between the ends of the fabrics of the seat pan and back rest and the cross members at the ends of the and seat pan frames.

With reference to the drawings and particularly to back rest FIG. 1, the improved seat comprises essentially three sections or frames, namely the upper or back and head rest portion 1, the intermediate or seat pan portion 2, and the lower or leg rest portion 3. The lower end of the upper section 1, and the rear end of the intermediate portion 2 are disposed in intersecting or overlapping relation indicated generally Aat 4.

The frame of the back and head rest or support oomprises the main spaced parallel longitudinal

side frame members

5 and 6 contoured somewhat to the shape of the back of the body of the average person who is to occupy the seat, the frame being further shaped and necked down at 9 at the upper end portion which is to be located at opposite sides of the head of an occupant, the frame being curved when viewed from the side somewhat similar to the average back curvature at 10 of the head of an occupant.

'Ihe lowerends of the side bars or

tubing

5 and 6 of the frame 1 are connected by an integral crossbar member 11, somewhat depressed or bent out of the plane of the frame at 12. A curved crossbar and brace member 13 connects the upper ends of the head portions 10 of the side frames 5 and 6 together forming a rigid substantially open frame with no supporting means inside of the area coniined by the frame, in the plane of the frame.

The frame 1, like the other associated

frames

2 and 3 is preferably formed of thin-walled strong lightweight metallic tubing, such as, for instance, one-half inch to ve-eighths inch O.D. titanium tubing.

The endless encircling frame members are cross-braced by tubular truss or

brace members

14, 15, 16 and 17, bowed rearwardly as seen in FIGS. 3 and 4, so as to lie materially rearward of the plane of the main supporting

tubular members

5, 6 and 10.

A strong resilient knitted or woven fabric such as made of nylon cords or strands is stretched in medium tension -across the main

endless frame members

5, 6, 10 and 13, this fabric being indicated at 18, and is suitably rmly connected through its perimeter to the main tubular frame, except at its lower end or edge, the fabric being preferably arranged on the bias.

The lower end portions of the side frame members are bent or disposed in closer parallel relation at 19 and a heavy strong, perferably nylon webbing'or strap member 20 is secured at each end to the lower ends 21 of the main frame 1. The lower edge of the nylon fabric structure 18 is securely suitably fastened to the webbing or strap as by stitching or cementing.

Ihe seat pan portion 2, best seen in FIGS. 5, 6 and 7 is also composed of thin-walled tubing and comprises parallel

side tubing members

22 and 23 bent at 24 to provide a wider rear end portion 25, connected by the integral crossbar 26. The two side frame members 22 land 23 are curved downwardly `at 27 terminating at their outer forward ends in hinge members 28 for connection of upper endsV of the leg supporting rest members 3 thereto. V

This frame 2 is also rmly cross-braced by the

tubing members

29, 30 extending or bowed downwardly below the plane of the side frames 22 and 23. However, an intermediate supporting tubing 31 is rigidly secured to the

brace members

29 and 30 at their juncture 31a and curves upwardly and forwardly at 32 into the plane of the curved portions 27 of the

side tubing members

29 and 30 with a hinge member 33 at its extremity in alignment with the hinge members 28. 'Ihis member 31 is designed to lie between the legs of an occupant and support the fabric 35 which is stretched across the frame between the legs of thoccupa'ntl A strong webbing or strap member 34 is stretched racross the frame between the portions of the frame 2 'and constitutes a strong flexible Vresilient support for the resilient fabric 35 that is stretched from side to side across the

side Vframe membersV

22 and 23 in a similar fashion to the fabric 18 and webbing 20. However, the other or lower end of the fabric 35 is also stretched over the lower or leg rest member or portion 3.

The member 3, as best seen in FIGS. 8, 9 and 10, is provided with complemental hinge members 28a and 34E which are pivoted to the

hinge members

28 and 34, the hinge members 28a being secured at the opposite ends of a somewhat U-shaped tubular frame comprising parallel side frame members 36 and 36a, the intermediate tubular member 37 extending from the hinge part 34a to a crossbar 38 which is firmly secured, as by welding, to the opposite ends of the

bars

36, 36a and 37.

it should be noted that the tubular leg supporting members are curved to Substantially the proper contour of the rear or calf portions of the average occupant at 39 and 48 and the crossbar 38, as seen in FIG. 10, is depressed at 41 intermediate the

longitudinal rails

36, 36a and 37 to form valleys or curved supporting portions in the stretched supporting fabric to -accommodate the leg portions of the occupant.

The leg rest frame 3 is also triangularly braced by diagonal

tubular brace members

42 and 43 which are bowed downwardly, materially out of the plane of the main leg frames 36, 36a and 37, and the fabric is stretched across between the side frame members 36 and 36a.

The upper ends of the

members

36 and 36a and 37 are curved at 4'4 so as to fair into the curvature of the

curved portions

27 and 32 of the seat pan portion when the

hinge element

28, 28a and 33, 33a are pivotally connected together and the

fabrics

18 and 35 are taut.

The triangular

tubular bracing elements

42 and 43 are each provided with hinge anchor elements 45 which are adapted to support the leg rest portion 3 against horizontal and vertical stresses. The back and headrest portion 1 is also supported at 46 (FIG. 3) and the back section 1 is adjusted to at least three positions indicated at 477 48 and 49 in FIG. l1.

The position 47, as shown in FIG. 11 is the launch or take-off position, for the aircraft or vehicle incorporating the seat, at high acceleration. During acceleration the angle of the occupants body, due to the give of the resilient fabric covering on the

frames

1, 2 and 3, as indicated diagrammatically at 47e. After take or blast-off the seat back is adjusted to the normal working position denoted diagrammatically at 48. It is also provided with a third position denoted at 49, which is a rest position. The means for adjusting the back section can be any conventional, mechanical or electrical adjusting mechanism between the supporting Istructure and the seat back and having three or more positions of adjustment and provided with control means convenient to the occupant and settable for automatic adjustment of the seat back to the

respective positions

47, 48 and 49.

As before mentioned the seat pan, and the back and i head rest are adjustable relative to each other to accommodate occupants of different heights, so as to be substantially universally adaptable for diiferent individuals of different heights, as well Vas adjustable angularly relative to each other. This is provided for by the arrangement of the lacing between the webs or

straps

34 and 20 and the end frames or

tubes

26 and 12 on the

respective sections

2 and 1. This lacing also secures the lower ends of the resilient fabric 18 to the back rest and the rear end of the fabric portion 35 to the seat pan 2 and provides the desired longitudinal tension on these

coverings

18 and 35.

The inner ends of the two

frames

1 and 2 overlap or sort of intersect each other as seen better in FIG. 2, the narrower end 21 of the back rest frame 1 extending through between the Wider portions 25 of the seat pan side frame 2. The

portions

21 and 25 clear each other by about three quarters of an inch on each side and are connected to each other for pivoting and longitudinal adjustments by the slidable pivot blocks 21a and 25a,'best seen in FIGS. 2, 13 and 14, later referred-to.

The blocks 21a are slidable along the frame portions 21 and may be clamped or fixed in any position along the narrower portions 21 of the back rest 1. The blocks 25a are likewise slidable along the wider portions of the side frame members 21 of the seat pan 2 and the two block sets 21a and 25a, as seen in FIGS. l2 and 13 are pivoted to each other, thus constituting the hinge or fulcrum between the seat pan 2 and the back rest 1. As shown in FIGS. 13 and 14 the pivot pins between the two blocks are retained therein by the tubular side frames 21 and 2S, retaining the pivot pins in place.

The nylon webs or

straps

20 and 34 are provided with spaced

eyelets

51 and 51a fairly close together through which the

lacings

50 and 50a are laced.

The lacing 50 is passed alternately through the eyelets 51 and around the end bar 26 until the lacing is substantially completely across the frame 2.

The lacing 50a is alternately passing through the eyelets 51a and around the end or crossbar 12 until the lacing for the fabric 18 is complete, substantially across the back frame 1. It is to be noted that the lacing 50 and 5i)a pass through each other, thus permitting longitudinal adjustments as well as angular pivotal adjustments about the pivotal center of the pivot blocks 21a and 25a.

The lacing and eyelets shown in FIGS. 2 and 14 are relatively widely spaced for clearness, obviously -the lacing would be closer together in practice.

Referring to FIGS. 12 and 13, the pivot blocks of each set, and there are four sets per seat, comprise two blocks each, having the semi-circular, longitudinal recesses to receive the respective side rods or

tubular frame members

21 and 25 and are provided with tightening screws 21h and 25h as clearly shown. The inner or adjacent blocks of each pair of sets are provided with aligned cores or

passages

21c and 25c in which is disposed a pivot pin 25d. The pivot pin 25d is disposed between the

side frame members

21 and 25 and these members retain the pivot pin in place against longitudinal movement.

From the above it will be observed that the nylon webbing can be suitably tensioned by the tension placed on the

lacings

50 and 50a and this is not eected by angular or longitudinal adjustments of the frames 1 and 2rela-tive to each other.

FIG. 14 disclosed a modified arrangement for connecting the inner ends of the

webbings

18 and 35 to the respective cross

frame end members

12 and 26.

The end straps or webs 20 secured to the webbing or meshas before and are provided with spaced nylon webs or straps 20a, which extend downwardly and around the end frame or rod 12, then upwardly and each is provided with a buckle 20h for individual tensioning adjustments.

Interposedv between the adjustable straps 20a are the similar straps or webs 34a which are equally spaced and each` is secured to the web 34 and extends rearwardly around the end crossbar or frame 26 of the seat pan 2, andthen forwardly and buckles 34b are provided for adjustment of and tension on the fabric 3S.

m Like the form shown in FIG.- 2, the

frames

1 and 2 are pivotally connected together by the slide blocks 2127L and 25a as shown-in FIG. 2.

The. above embodiments of the invention herein shown and described are to be regarded'as illustrative only and it is to be understood that the invention is susceptible to variations modifications and changes'within the scope of the appended claims.

, If desired suitable extensions 52 may be provided at the top of the back rest 2 and at the lower end of the leg rest 3 which may be connected to Vthe aircraft supporting structure for further stabilization and angular adjustment of the sections.

When acceleration forces are applied to the seat the supporting resilient nylon fabric yieldably' conforms to the back of the occupantand uniformly supports the occupant from head to foot against acceleration forces withoutdzmger or blackout, event up to 16 Gs. l

If desired theV frame may be provided with holddown 6 pads and resilient protectors engaging the forward portions of the occupant, such as the body portion, head, arms and legs to hold the occupant in place on the nylon fabric 35 during excessive decelerations, also the seat may be provided with arm rest of yieldable pad material, and an instrument control panel placed convenient to the fingers yof the occupant to control the relative angular adjustment of the seat or

chair elements

1 and 2 and other necessary controlled devices, such as the holddown pads (not shown) for the occupants head, shoulders, body, knees and legs during deceleration to hold the occupant rrnly in position on the seat during severe decelerations.

Since the back element 1 of the chair is provided, as shown diagrammatically in FIG. l1, with three adjustments indicated at 47, 48 and 49, some adjusting means is preferably provided for automatically adjusting the seat back to these several positions. The adjusting means itself forms no part of the invention and any type of position adjusting means may be provided, also if more than three adjustments are desired, this can be accomplished in a self-evident manner. By employing a reversible motor (A) operating a lever B connected by a link C to the back of back rest side bars or truss bracing at D adjustment can be automatically accomplished, the motor A being of hydraulic piston and cylinder type pivoted at E and controlled by three-way valve F through a valve handle G, pressure being supplied by a suitable source through inlet pipe H. Moving the handle G forward shifts the back rest to the position 47. Shifting the handle'G to mid-position opens both ports to pressure and shifts the back rest to the position 48, while pulling the valve handle back inclines the back -rest to the rest position 49.

When acceleration occurs with the occupant inclined forwardly, as indicated by dotted line 47 the resilient nylon fabric gives, and conforms to the curvature of the back of the occupant and comfortably supports substantially all of the back por-tion, allowing the occupant to assume a further forwardly inclined position, due to the give of the fabric, diagrammatically indicated at 471L in FIG. 1l.

Where holddown means are used for embracing the occupants body, head and parts of the limbs, similar tensioning means for the various holddown elements can be incorporated on the frame of the chair, to that of the back frame adjustment mechanism, with the controls therefor placed on the chair convenient for manipulation and control by the hands of the occupant.

It will be apparent that various modifications and minor changes may be made in construction as shown and described without departing from the spirit and scope of the invention as defined by the accompanying claims.

What we claim is:

1. An adjustable seat comprising an upper open back and head supporting frame substantially conforming in side profile to the curvature of the back, neck and head of an occupant for said seat, said frame having spaced side frame members and transverse cross frame members connected substantially at the opposite ends of the side frame membcrs, an open seat thigh and leg supportingV frame having a side profile conforming substantially to the contour of the back of the seat, thighs and legs of an occupant for the seat, said frame members being disposed at the lower end portion of the back and head portion of the back and head supporting frame in angularly intersecting relation to the rear end portion of the seat supporting portion of said seat, thigh and leg supporting frame, adjustable pivot means connecting said frames together for pivotal adjustment at the points of angular intersection thereof, said pivot means being adjustable longitudinally along the side frame members of both of said back and head supporting frame and saidV seat thighV and leg supporting frame for vertical adjustment of said back and headsupporting frame on said seat, thigh and leglsu'pporting frame andr for forward and'rearward adjustment of said seat, thigh and leg supporting frame, relative to said back and leg supporting frame, a first liexible resilient covering tensioned across said open back and head supporting frame and secured to the side and cross frame members thereof, a second independent resilient llexible covering tensioned across said seat, thigh and leg supporting frame and secured to the side and cross frame members thereof.

2. An adjustable seat comprising an open back supporting frame having a lower parallel extension and a seat supporting frame having a rear parallel extension disposed in angular crossing relation to the first mentioned extension, one of said extensions being wider than the other extension, pivot means connecting said extensions together for agular and longitudinal adjustments, said pivot means being slidably secured to both of said extensions for longitudinal adjustment of either of said frames with respect to the other frame, a cross web member connected from side to side to each of said frames adjacent the beginning of said extensions, a exible resilient covering tensioned across each of said frames and secured along its perimeter to the opposite sides and to the end remote from the extension of each of said frames, and to the cross web member of that frame, said coverings being independent of each other, laterally spaced connecting means between said cross web members and the outer end portions of said extensions with said connecting means between the cross web member and said remote end portion of the extension of one of the frames disposed intermediate the spaced connecting means between the cross web member and said remote outer end portion of the extensions of the other frame.

3. An adjustable seat having an upper open back supporting frame having substantially parallel spaced side frame members and an upper cross frame member connecting the upper ends of the side frame members together, said side frame members having spaced parallel extensions at their opposite ends and a lower cross frame member connecting the outer ends of said extensions forming a lower extension, together forming said open rigid back supporting frame, said frame having a side profile conforming substantially to the back profile of an average occupant for said seat, said seat having an open seat and thigh supporting frame having substantially parallel side frame members and a forward transverse cross frame member connecting the forward ends of the last mentioned side frame members together, said seat and thigh supporting frame having a side contour conforming substantially to the back profile of the seat and thighs of an average occupant for said seat, said substantially parallel side frame members of said seat and thigh supporting frame having parallel rearward extensions thereon Iat the rear ends thereof and a transverse rear cross frame member connecting the outer ends of said last mentioned extensions together, forming a rearward extension on said seat and thigh supporting frame, said lower extension and said rearward extension being of different widths and disposed in intersecting angular relation to each other, longitudinally yadjustable pivot means slidably and pivotally connecting both sides of said lower and rearward extensions together for'relative longitudinal adjustment on each other, a first transverse narrow web member tensioned across said back supporting frame adjacent said lower extension between the back supporting frame and its lower extension, a second transversed narrow web member tensioned across saidseat and thigh supporting frame adjacent the said rearward extension between the seat and thigh supporting frame and its rearward extension, a first reslient exible covering tensioned across said back supporting frameconnected at opposite sides s and upper end around its perimeter to said side frame members and to said upper cross frame Ymember of said back supporting frame and secured across its lower edge to said first transverse narrow web member on the last mentioned frame, laterally spaced lacing means disposed between the sides of said lower extension connecting said first transverse narrow web member on said back supporting frame to said lower transverse cross frame member on said lower extension on the last mentioned frame, a second resilient flexible covering tensioned across said seat and thigh supporting frame connected at opposite sides and its forward end around .its perimeter to the substantially parallel side frame members and the connected transverse forward cross frame member of said seat and thigh supporting frame, and secured across its opposite end to the second transverse web member of the last mentioned frame, a second adjustable laterally spaced lacing means passing through and between the iirst mentioned lacing means connecting said second transverse web member to said rear transverse cross frame member of said rearward extension, whereby said back supporting frame and said seat and thigh supporting frame are both angularly and longitudinally adjustable relative to Veach other without disturbing the tension on the two exible resilient coverings.

4. A crew seat for aircraft and the like responsive to high acceleration comprising an open back frame having a profile substantially conforming in side elevation to the curvature of the back of an occupant therefor, an open seat frame having a profile in side elevation substantially conforming to the rear of the seat and lower portion of an occupant therefor, adjustable pivot means on said open back frame and on said open seat frame comprising means for pivotal and longitudinal adjustments of said back and seat frames relative to each other, a first flexible resilient supporting fabric tensioned across said open back frame from side to side and end to end to support the back and upper portion of an occupant, a second exible resilient fabric tensioned across said open seat frame from end to end and side to side independently of said first flexible resilient fabric to support the seat and lower portion of the occupant, whereby upon acceleration of anjaircraft having the said seat mountedthereon the fabrics will yield independently of each other and substantially conform to the back of the body and lower portion of the body of an occupant occupying the seat.

5. A crew seat for aircraft and the like responsive to high accelerations comprising an endless open back, neck and head supporting frame substantially conforming in side profile to the curvature of the back, neck of the body and head of an occupant therefor, an endless open seat and leg supporting frame Vhaving a side profile substantially conforming to the back of the lower portion of an occupant therefor, said lower end portion of said back, neck, and head supporting frame and the rear portion of said seat and leg supporting frame disposed in angularly intersecting relation, adjustable pivot means disposed on the line of intersection between said frames between said back and head supporting frame and said seat and leg supporting frame comprising means for pivotal adjustments between said open back and head supporting frame and said open seat and leg supporting framev and longitudinal adjustments of each of said frames on the other frame, a first flexible resilient body supporting fabric tensioned across said open back and head supporting frame lfrom end to end and side to side, a second flexible resilient supporting fabric tensioned across said'open seat and leg supporting frame from end to end and side to side in-` dependently of said first resilient supporting fabric, whereby upon accelerations of an aircraft having the seat fixed therein the fabrics will yield independently of each other and conform substantially to the curvature back, neck and head portions and to the rear portions of the seat, lower portion and legs of an occupant occupying the seat, to substantially support the entire back portion from head to legs of an occupant occupying said seat during high accelerations of an aircraft having said seat fixed therein. K l

Y6. A crew seat for an aircraft and the like which is responsive to high accelerations comprising, an endless open back and head supporting frame having a curved proiile in side elevation substantially conforming to the curvature of the back portion of the body and head of an occupant for the seat, said frame having a lower extension terminating in a transverse cross bar, an endless open seat and leg supporting frame having a curved proiile in side elevation substantially conforming to the back of the seat, lower portion, and legs of an occupant for the seat, said open seat and leg supporting frame having a rearwardly extending extension terminating in a transverse -cross bar, a rst resilient exible fabric tensioned across said head and back supporting frame from side to side and from the upper end terminating substantially at the beginning of said extension of said back and head supporting frame, a second resilient exible fabric tensioned across said open seat and leg supporting frame from side to side and from the forward end of that frame terminating substantially at the beginning of said rearward extensions, said seat having said lower extension and said rearward extension disposed in crossed or overlapped relation, adjustable pivot clamp means between said extensions providing pivot means between said back and head supporting frame and said seat and leg supporting frame and providing individual longitudinal adjustment of said back and head supporting frame on said seat and leg supporting frame and forward and rearward adjustment of said back and head supporting frame on said seat and leg supporting frame and angular adjustments between said frames, spaced longitudinal tensional means between the lower end of said first resilient exible fabric and said transverse bar on said rearward extension for tensioning Said rst fabric between the upper and lower ends of said back and head supporting frame, and spaced longitudinal tensioning means between the rear end of said second resilient fabric and said transverse cross bar on said rearward extension, extending through the spaces between the first mentioned tensioningmeans, for adjusting the fore and aft tensions on said second fabric permitting the aforesaid longitudinal adjustment of the back and head supporting frame, the forward and rearward relative adjustments of the seat and leg supporting frames, and angular adjustments between the frames, without disturbing the tension on the exible resilient fabrics on said frames.

7. An adjustable seat comprising an upper back, neck and head supporting open frame substantially conforming in side prole to the curvature of the back of the body, neck and head of an occupant for said seat, said frame comprising spaced apart parallel tubular side members, a connected upper tubular cross member therebetween, a lower tubular cross frame member connected between the lower ends of said tubular side frame members, a transverse flexible cross web member connected to said side frame members in materially upwardly spaced relation from said lower tubular cross frame member, a resilient exible nylon mesh body, neck and head supporting fabric tensioned completely across said frames between said tubular side frame members and between said upper tubular cross frame member and said transverse exble cross web member, first transversely spaced flexible connecting tensioning means between said web member and said lower tubular cross frame member, a lower seat, thigh and leg supporting open frame substantially conforming in side profile to the curvature of the back portions of the seat, thighs and legs of an occupant for said seat, said lower seat, thigh and leg supporting open frame comprising spaced parallel tubular side frame members, the lower end of said upper frame below said ilexible cross web member extending a material distance angularly through between said tubular side frame members of said open seat, thigh and leg supporting framel adjustable clamping pivot means slidably and pivotally connecting said tubular parallel side frame members at both sides together at the point of angular intersection of the upper and lower frames, said pivot means being slidably adjustable on the tubular side frame members of both of said frames, transverse cross bar member connecting the extremities of the parallel tubular side frame members of the lower frame together at its forward and rear intersecting ends, a second cross web member connected to the last mentioned side frame members forwardly of the point of intersection thereof by said upper frame, a resilient nylon mesh seat, thigh and leg supporting fabric tensioned completely across said lower frame between the tubular side frame members and between the cross frame member remote from the point of intersection of the frames and said second cross web member, and a second transversely spaced flexible connecting means extending through the spaces between the first transversely spaced connecting means and connecting said second web member to the transverse cross frame member of said lower frame at the other side of the intersection between the two frames.

8. Apparatus as claimed in claim 7 in which said lower, seat, thigh and leg supporting open frame is adjustably hinged intermediate its longitudinal ends between the seat and thigh supporting portion and the leg supportting portion thereof, to provide angular adjustments in said lower open seat, thigh and leg supporting frame, between the thigh and leg supporting portions, and cross bracing between the side frame members of said lower frame bent materially rearwardly and downwardly out of the plane of said second resilient fabric, whereby when said fabrics gives during accelerations the bent portions will be out of the path of deflection of that seat fabric.

9. Apparatus as claimed in claim 8 in which said lower frame is provided with an intermediate longitudinal rigid supporting member parallel to the side frame members and extending upwardly from the lower cross frame member to a point intermedial the seat supporting portion and the thigh supporting portion, to support the said second fabric on that frame, between the legs and thighs of an occupant occupying the seat.

References Cited in the file of this patent UNITED STATES PATENTS 845,039 Leavitt Feb. 19, 1907 2,355,635 Dubilier Aug. 15, 1944 2,586,433 Lepp et al Feb. 19, 1952 2,702,074 Vincent Feb. l5, 1955 2,751,606 Benker June 26, 1956, 2,812,146 Chaplin Nov. 5, 1957 2,829,702 Keating Apr. 8, 1958 2,831,529 Williams Apr. 22, 1958 FOREIGN PATENTS 7,264 Great Britain l y 1884